Leaking Sink fitting

I just changed my sinks (old painted steel) and decided to change the shut off valves. One of the valve has a leak around the threads. I already wrapped the threads with teflon and that did help. I do not want to cut off the stub coming out of the wall to put a new fitting on. Can I just use silican or plumbers putty around the fitting?

Leaking Sink fitting

Is it the threads on the pipe coming out of the wall before the shut off or is it the thread on the supply tube that feeds the tap? If it is the before the shut off thread, you may want to try a new shut off valve, i have seen may a person overtighten. When this happens you will stretch the brass that the shut off is made of and never make a seal. Three wraps of teflon in the same direction as the thread should do it and 1 full rotation past hand tight. If it is the supply tube threads check that the ferreul is on properly or use the 1 piece braided lav supply tubes, they are easiest. Teflon is actually not a pipe seal but a lubricant so the threads tighten properly. Pipe dope is really not necessary. Good luck.